📝 Add GitMoji commit convention and contribution guidelines

CONTRIBUTING.md

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+## GitMoji Commit Convention
+
+We use the GitMoji convention for our commit messages. Each commit message should start with an emoji, followed by a verb in present tense, and a brief description of what was done. Here are the emojis we use and their meanings:
+
+- ✨ for adding a feature
+- ⚡ for improving a feature
+- 🐛 for fixing a bug
+- ✏️ for adding or updating headers or Makefile
+- 🔀 for merging a branch into another
+- 🚚 for changing the repository's structure (renaming or moving files)
+- 🥅 for error handling
+- ♻️ for Refactoring code in a better way
+- 🚧 for work in progress
+- 🔥 for removing code
+- ⚰️ for removing deprecated/unused code
+- 🚨 for fixing warnings
+- 🎉 for initial commit
+- 📝 for adding documentation
+- ✅ for adding tests
+- 🙈 for adding .gitignore
+- 🔧 for adding or updating configuration files
+- 🍱 for adding resources
+- 🎨 for improving code structure/format
+- 👷 for adding or updating files needed for continuous integration (CI)
+- 🥚 for adding bonus or easter egg
+
+
+Here's an example of a valid commit message:
+
+```
+✨ Add new feature to improve user experience
+```
+
+## Branching and Merging
+
+- Do not push directly to the main branch.
+- Create a branch related to the current issue and make a pull request (PR) to merge the branch.
+- At least one person must approve the PR before it can be merged.
+
+## Test Politics
+
+- Criterion
+
+## Code Quality
+
+- Always maintain high-quality code.
+
+
+Thank you for contributing to the Haskell Image Compressor !